Table 7
Sensitivity, specificity, and positive and negative predictive values for parent-reported and corrected body mass index categories, subsample B, household population aged 6 to 11, Canada, 2007 to 2009
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International Obesity Task Force BMI cut-points | World Health Organization BMI cut-points | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Parent-reported | Corrected | Parent-reported | Corrected | |||||||||
% | 95% confidence interval | % | 95% confidence interval | % | 95% confidence interval | % | 95% confidence interval | |||||
from | to | from | to | from | to | from | to | |||||
Sensitivity (% true positives) | ||||||||||||
Normal weight | 83.0 | 76.0 | 88.3 | 87.1* | 79.9 | 91.9 | 79.4 | 70.7 | 86.0 | 86.1* | 76.8 | 92.1 |
Overweight | 59.4 | 46.4 | 71.2 | 60.0 | 48.4 | 70.5 | 38.7 | 26.9 | 52.0 | 37.6 | 22.0 | 56.4 |
Obese | 57.2 | 32.5 | 78.8 | 52.7 | 27.2 | 76.9 | 62.6 | 42.3 | 79.3 | 69.5 | 52.9 | 82.3 |
Specificity (% true negatives) | ||||||||||||
Normal weight | 77.7 | 61.7 | 88.3 | 75.7 | 61.0 | 86.1 | 72.0 | 59.0 | 82.1 | 68.8 | 55.0 | 79.9 |
Overweight | 90.1 | 84.4 | 93.9 | 89.1 | 83.2 | 93.1 | 85.6 | 79.7 | 90.0 | 87.4 | 79.8 | 92.3 |
Obese | 90.0 | 82.7 | 94.5 | 94.5* | 88.7 | 97.4 | 87.4 | 80.7 | 92.0 | 92.9* | 87.3 | 96.2 |
Positive predictive value | ||||||||||||
Normal weight | 92.0 | 84.3 | 96.1 | 91.7 | 84.5 | 95.7 | 82.6 | 75.0 | 88.3 | 82.2 | 73.5 | 88.6 |
Overweight | 58.9 | 47.8 | 69.2 | 56.7 | 42.4 | 70.0 | 44.5 | 30.9 | 59.0 | 47.1 | 28.3 | 66.8 |
Obese | 24.0 | 13.4 | 39.2 | 34.6 | 13.2 | 64.7 | 45.3 | 30.1 | 61.5 | 62.2* | 44.3 | 77.4 |
Negative predictive value | ||||||||||||
Normal weight | 59.7 | 50.9 | 67.9 | 65.4 | 52.2 | 76.6 | 67.6 | 59.9 | 74.4 | 74.7* | 63.4 | 83.5 |
Overweight | 90.3 | 83.7 | 94.4 | 90.3 | 84.1 | 94.3 | 82.4 | 74.8 | 88.0 | 82.4 | 73.4 | 88.8 |
Obese | 97.5 | 93.5 | 99.0 | 97.3 | 93.4 | 98.9 | 93.3 | 88.1 | 96.3 | 94.8 | 90.9 | 97.1 |
* significantly different from self-reported estimate (p < 0.05) Source: 2007 to 2009 Canadian Health Measures Survey. |
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